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Impulse signal acquisition method and apparatusRelated Patent Categories: Pulse Or Digital Communications, Spread SpectrumImpulse signal acquisition method and apparatus description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070116096, Impulse signal acquisition method and apparatus. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority from Korean Patent Application No. 2005-111864 filed Nov. 22, 2005, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] Methods and apparatuses consistent with the present invention relate to acquiring an impulse signal, and more particularly, to the acquisition of an impulse signal having a wide cell from an impulse signal used for transmitting and receiving data in an ultra wide band (UWB) communication system and then acquiring an impulse signal having a narrow cell inside the impulse having the wide cell. [0004] 2. Description of the Related Art [0005] Unlike existing narrow band communications for transmitting data together with carrier waves with a base band signal, recent UWB wireless technology is used to transmit data using ultra-short base band pulses reaching several nano-seconds without carrier waves. [0006] FIG. 1A is a block diagram of a related art UWB communication system which performs a serial search to acquire an impulse signal. [0007] Referring to FIG. 1A, a received signal is multiplied by a template signal output from a time hopping (TH) code generator 120 by a multiplier 110 and then applied to a correlator 130. A signal y output from the correlator 130 is compared with a threshold value .xi. by a comparator 140. If the signal y is smaller than the threshold .xi., the signal y is applied to an acquisition controller 150. If the signal y is larger than the threshold value .xi., a serial search process shown in FIG. 1B is performed to acquire an impulse signal. [0008] FIG. 1B is a view illustrating a serial search process for acquiring an impulse signal. [0009] As shown in FIG. 1B, in a case where a received signal and a template signal do not synchronize with each other due to two cells, the acquisition controller 150 controls the TH code generator 120 to delay the template signal by one cell and then by another cell so as to synchronize the template signal with the received signal. [0010] Here, an operation of acquiring the template signal synchronized with the received signal is performed using a sub-nanosecond cell. [0011] Also, in an uncertainty region of 20 nanoseconds (ns), an impulse acquisition is tested 20 times in the unit of 1 ns cell. Additionally, in a case where the uncertainty region is 1 microsecond (.mu.s) and a cell is 0.25 ns, 4000 cells are required. Thus, 4000 tests must be performed. An average impulse acquisition time for acquiring an impulse radio (IR)-UWB signal is 500 ms to about 1 second. [0012] As described above, in the related art, a large number of tests are required for acquiring an impulse signal. Also, a large amount of time is required for acquiring the impulse signal, which increases power consumption. SUMMARY OF THE INVENTION [0013] Exemplary embodiments of the present invention overcome the above disadvantages and other disadvantages not described above. Also, the present invention is not required to overcome the disadvantages described above, and an exemplary embodiment of the present invention may not overcome any of the problems described above. [0014] The present invention provides an impulse signal acquisition method and apparatus for acquiring an impulse signal having a wide cell from an impulse signal used for transmitting and receiving data in an UWB communication system and then acquiring an impulse signal having a narrow cell inside the impulse signal having the wide cell. [0015] The present invention also provides an impulse signal acquisition transmitter comprising an impulse generator which varies a pulse width of an impulse signal used for transmitting data according to a predetermined control signal to generate the impulse signal, and a controller which applies a pulse width control signal used to vary the pulse width of the impulse signal to the impulse generator. [0016] The impulse generator may generate an impulse signal having a narrow cell or an impulse signal having an N-times wider cell than the narrow cell according to the pulse width control signal. [0017] If a pulse width of the impulse signal having the narrow cell is 1 ns, a pulse width of the impulse signal having the wide cell is 2 ns. [0018] According to another aspect of the present invention, there is provided an impulse signal acquisition transmitter comprising a first impulse generator which generates a first impulse signal having a first pulse width; a second impulse generator which generates a second impulse signal having a second pulse width; an N.sup.th impulse generator which generates an N.sup.th impulse signal having an N.sup.th pulse width; a switch which switches one of the first, second, and N.sup.th impulse generators according to a predetermined control signal to generate an impulse signal; and a controller which controls the switch so as to generate the impulse signal. [0019] The first, second, and N.sup.th impulse generators may generate impulse signals which have narrow or wide cells. [0020] According to another aspect of the present invention, there is provided an impulse signal acquisition receiver comprising an impulse generator which varies a pulse width according to a predetermined control signal to generate an impulse signal to be multiplied by a received signal; a comparator which compares the received signal with a threshold value; and a controller which applies a pulse width control signal which varies the pulse width to the impulse generator and shifts a phase of the impulse signal so as to synchronize the impulse signal with the received signal. [0021] The impulse generator may generate an impulse signal having a narrow cell or an impulse signal having an N-times wider cell than the narrow cell according to the pulse width control signal. Continue reading about Impulse signal acquisition method and apparatus... 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